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menu_bar.go
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menu_bar.go
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package glfw
import (
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/driver/desktop"
"fyne.io/fyne/v2/internal/widget"
"fyne.io/fyne/v2/theme"
)
var _ fyne.Widget = (*MenuBar)(nil)
// MenuBar is a widget for displaying a fyne.MainMenu in a bar.
type MenuBar struct {
widget.Base
Items []fyne.CanvasObject
active bool
activeItem *menuBarItem
canvas fyne.Canvas
}
// NewMenuBar creates a menu bar populated with items from the passed main menu structure.
func NewMenuBar(mainMenu *fyne.MainMenu, canvas fyne.Canvas) *MenuBar {
items := make([]fyne.CanvasObject, len(mainMenu.Items))
b := &MenuBar{Items: items, canvas: canvas}
b.ExtendBaseWidget(b)
for i, menu := range mainMenu.Items {
barItem := &menuBarItem{Menu: menu, Parent: b}
barItem.ExtendBaseWidget(barItem)
items[i] = barItem
}
return b
}
// CreateRenderer returns a new renderer for the menu bar.
//
// Implements: fyne.Widget
func (b *MenuBar) CreateRenderer() fyne.WidgetRenderer {
cont := container.NewHBox(b.Items...)
background := canvas.NewRectangle(theme.ButtonColor())
underlay := &menuBarUnderlay{action: b.deactivate}
underlay.ExtendBaseWidget(underlay)
objects := []fyne.CanvasObject{underlay, background, cont}
for _, item := range b.Items {
objects = append(objects, item.(*menuBarItem).Child())
}
return &menuBarRenderer{
widget.NewShadowingRenderer(objects, widget.MenuLevel),
b,
background,
underlay,
cont,
}
}
// IsActive returns whether the menu bar is active or not.
// An active menu bar shows the current selected menu and should have the focus.
func (b *MenuBar) IsActive() bool {
return b.active
}
// Toggle changes the activation state of the menu bar.
// On activation, the first item will become active.
func (b *MenuBar) Toggle() {
b.toggle(b.Items[0].(*menuBarItem))
}
func (b *MenuBar) activateChild(item *menuBarItem) {
if !b.active {
b.active = true
}
if item.Child() != nil {
item.Child().DeactivateChild()
}
if b.activeItem == item {
return
}
if b.activeItem != nil {
if c := b.activeItem.Child(); c != nil {
c.Hide()
}
b.activeItem.Refresh()
}
b.activeItem = item
if item == nil {
return
}
item.Refresh()
item.Child().Show()
b.Refresh()
}
func (b *MenuBar) deactivate() {
if !b.active {
return
}
b.active = false
if b.activeItem != nil {
if c := b.activeItem.Child(); c != nil {
defer c.Dismiss()
c.Hide()
}
b.activeItem.Refresh()
b.activeItem = nil
}
b.Refresh()
}
func (b *MenuBar) toggle(item *menuBarItem) {
if b.active {
b.canvas.Unfocus()
b.deactivate()
} else {
b.activateChild(item)
b.canvas.Focus(item)
}
}
type menuBarRenderer struct {
*widget.ShadowingRenderer
b *MenuBar
background *canvas.Rectangle
underlay *menuBarUnderlay
cont *fyne.Container
}
func (r *menuBarRenderer) Layout(size fyne.Size) {
r.LayoutShadow(size, fyne.NewPos(0, 0))
minSize := r.MinSize()
if size.Height != minSize.Height || size.Width < minSize.Width {
r.b.Resize(fyne.NewSize(fyne.Max(size.Width, minSize.Width), minSize.Height))
return
}
if r.b.active {
r.underlay.Resize(r.b.canvas.Size())
} else {
r.underlay.Resize(fyne.NewSize(0, 0))
}
r.cont.Resize(fyne.NewSize(size.Width-2*theme.Padding(), size.Height))
r.cont.Move(fyne.NewPos(theme.Padding(), 0))
if item := r.b.activeItem; item != nil {
if item.Child().Size().IsZero() {
item.Child().Resize(item.Child().MinSize())
}
item.Child().Move(fyne.NewPos(item.Position().X+theme.Padding(), item.Size().Height))
}
r.background.Resize(size)
}
func (r *menuBarRenderer) MinSize() fyne.Size {
return r.cont.MinSize().Add(fyne.NewSize(theme.Padding()*2, 0))
}
func (r *menuBarRenderer) Refresh() {
r.Layout(r.b.Size())
r.background.FillColor = theme.ButtonColor()
r.background.Refresh()
r.ShadowingRenderer.RefreshShadow()
canvas.Refresh(r.b)
}
// Transparent underlay shown as soon as menu is active.
// It catches mouse events outside the menu's objects.
type menuBarUnderlay struct {
widget.Base
action func()
}
var _ fyne.Widget = (*menuBarUnderlay)(nil)
var _ fyne.Tappable = (*menuBarUnderlay)(nil) // deactivate menu on click outside
var _ desktop.Hoverable = (*menuBarUnderlay)(nil) // block hover events on main content
func (u *menuBarUnderlay) CreateRenderer() fyne.WidgetRenderer {
return &menuUnderlayRenderer{}
}
func (u *menuBarUnderlay) MouseIn(*desktop.MouseEvent) {
}
func (u *menuBarUnderlay) MouseOut() {
}
func (u *menuBarUnderlay) MouseMoved(*desktop.MouseEvent) {
}
func (u *menuBarUnderlay) Tapped(*fyne.PointEvent) {
u.action()
}
type menuUnderlayRenderer struct {
widget.BaseRenderer
}
var _ fyne.WidgetRenderer = (*menuUnderlayRenderer)(nil)
func (r *menuUnderlayRenderer) Layout(fyne.Size) {
}
func (r *menuUnderlayRenderer) MinSize() fyne.Size {
return fyne.NewSize(0, 0)
}
func (r *menuUnderlayRenderer) Refresh() {
}